#!python

if __name__=='__main__': 
    '''Demo of newton iteration.'''
    r=1.0;
    op = float(raw_input('The operand to get square root: '));
    for i in range(1000): 
	r = (r+op/r)/2;
    print 'The square root of %f is: %f\n' % (op, r);

		
